摘要:
Lubricating oil composition comprising a major proportion of a mineral lubricating oil and, as viscosity index improver, a hydrogenated block copolymer or olefin copolymer functionalized by the presence of carboxyl groups attached to the polymer chain by a sulphonamide linkage.
摘要:
A fluid having an improved viscosity/temperature relationship results from a blend of that fluid and a block copolymer having an AB configuration wherein the A portion is a polymeric structure that is insoluble in said oil below a characteristic temperature and soluble above that temperature and the B portion is a polymeric structure that is soluble in said fluid over the complete range of temperature for which the liquid composition will be used and wherein the chain length of said B portion is small relative to that of said A portion. Fluid compositions having a relatively constant viscosity over an extended temperature range result when two or more such block polymers are blended with the fluid.
摘要:
THIS INVENTION RELATES TO MINERAL OIL COMPOSITIONS COMPRISING A NEUTRAL, NON-VOLATILE, MINERAL OIL AND AN EFFECTIVE AMOUNT OF A VISCOSITY INDEX IMPROVER SELECTED FROM A LIMITED CLASS OF OIL-SOLUBLE, SUBSTANTIALLY LINEAR, ETHYLENE,HYDROCARBON COPOLYMERS CONTAINING 25 TO 55 WEIGHT PERCENT POLYMERIZED ETHYLENE UNITS AND HAVNG A PENDENT INDEX OF 18 TO 33, AN AVERAGE PENDENT SIZE NOT EXCEEDING 10 CARBON ATOMS, AN AVERAGE CHAIN LENGTHL OF 2,700 8,800 CARBON ATOMS AND AN INHERENT VISCOSITY OF 0.7 TO 1.8 AS MEASURED ON A 0.1 WEIGHT PERCENT SOLUTION IN TETRACHLOROETHYLENE AT 30*C.
摘要:
A composition is provided to comprise a non-aqueous medium and a 3,4-oxypyridinone compound of structure (I):
with each A being oxygen and/or sulfur, and with a variety of substituents at R1-R5 to enable a solution or an at least semi-stable emulsion to be formed in the non-aqueous medium. Methods of use are included herein, which may be focused on situations where the composition can be used as a lubricant and/or coolant.
摘要:
The disclosure relates to viscosity improver concentrates comprising a bio-based liquid decarboxylated rosin acid as a solubilizer, and a viscosity index improver. The viscosity improver concentrate is used in lubricating oil compositions comprising base oil and optional additives. The decarboxylated rosin acid component has at least one or more of: one or more C═C groups, and 40-100 wt. % of tricyclic compounds having 18-20 carbon atoms; a sum of tricyclic compounds as aromatic and cycloaliphatic of 50-100 wt. %, based on total weight of the decarboxylated rosin acid; and an amount of cycloaliphatic compounds of 15-100 wt. %, based on total weight of the decarboxylated rosin acid. The viscosity improver concentrates comprising the solubilizer have comparable properties, including compatibility, kinematic viscosity, and viscosity index, to other commonly used fossil based solubilizers.
摘要:
A lubricant composition with a comb polymer and a synthetic base oil has improved viscosity characteristics at low operating temperatures. In addition, a comb polymer can be used for producing a lubricant having an R-factor of less than or equal to 8, wherein the R-factor is defined as the ratio of the kinematic viscosity at −20° C. and the kinematic viscosity at +20° C.
摘要:
A viscosity index improver containing, in diluent oil, one or more optionally functionalized linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene in an amount that is greater than the critical overlap concentration (ch*), in mass %, for the linear block copolymers in the diluent oil; and ester base stock and/or at least one star (or radial) polymer, the star polymer being present in an amount such that the c/ch* value of the star polymer in the concentrate falls within the range of from 0.01 to about 1.6, wherein c is the concentration in mass % of star polymer in the concentrate and ch* is the critical overlap concentration in mass % for the star polymer in the diluent oil used to form the concentrate.
摘要:
Disclosed is a star copolymer (C) including at least 10 wt. % of units derived from styrene monomer and including arms that include a statistical copolymer (EP) including ethylene units and propylene units, and the method for preparing same. Also disclosed is the use thereof in lubricating compositions, in particular for improving the viscosity index, to the lubricating compositions thus obtained and to the uses thereof.
摘要:
A lithium salt thickener that enhances thermal stability at high temperature and operability at low temperature, and a grease composition including the same, is provided.